I would like to make some polysulfide toner but the main ingredient “Liver of Sulphur” appears to be imposable to obtain in solid form here in the UK now. Does anyone know where to get solid liver of sulphur in the UK or has anyone made polysulfide toners using the liver of sulphur gels that are available if so how much are you using. I know Photographers Formulary sell a polysulfide toner, and I will probably order some when I do my next bulk order to them, but shipping to the UK is expensive. I also know that Moersch sienna toner is a polysulfide toner but again it is very expensive. I also here that sodium polysulfide can be used in place of liver of sulphur, has any one tried this? And does it work.